[v5.15] BUG: unable to handle kernel paging request in ioread32
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syzbot
Aug 4, 2026, 4:57:41 PM (yesterday) Aug 4
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 6e2fd6534337 Linux 5.15.213
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14f27e32580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f161cbc9aef65db0
dashboard link: https://syzkaller.appspot.com/bug?extid=6f1d620d17b844ec2cf7
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d7b46606b13d/disk-6e2fd653.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/da120fdeb081/vmlinux-6e2fd653.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3c2643457e3f/bzImage-6e2fd653.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6f1d62...@syzkaller.appspotmail.com
BUG: unable to handle page fault for address: 0000000000055640
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 5f69b067 P4D 5f69b067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4231 Comm: kworker/0:5 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events work_for_cpu_fn
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x18/0x80 lib/iomap.c:90
Code: b7 c0 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 53 48 89 fb e8 36 fd 8c fd 48 81 fb 00 00 04 00 72 09 e8 28 fd 8c fd <8b> 03 eb 58 48 81 fb 01 00 01 00 72 0b e8 16 fd 8c fd 0f b7 d3 ed
RSP: 0018:ffffc900031afae8 EFLAGS: 00010293
RAX: ffffffff83ebff88 RBX: 0000000000055640 RCX: ffff888021f31dc0
RDX: 0000000000000000 RSI: ffffffff8a2b2be0 RDI: 0000000000055640
RBP: ffffc900031afbd0 R08: ffffffff901ee117 R09: 1ffffffff203dc22
R10: dffffc0000000000 R11: fffffbfff203dc23 R12: 0000000000055640
R13: ffffffff8a7ed398 R14: 1ffff92000635f68 R15: ffff8880621e9828
FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000055640 CR3: 0000000063baf000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
nhi_probe+0x225/0xb40 drivers/thunderbolt/nhi.c:1281
local_pci_probe+0xc5/0x150 drivers/pci/pci-driver.c:323
work_for_cpu_fn+0x50/0x80 kernel/workqueue.c:5217
process_one_work+0x867/0xff0 kernel/workqueue.c:2310
process_scheduled_works kernel/workqueue.c:2373 [inline]
worker_thread+0xe01/0x12a0 kernel/workqueue.c:2462
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
Modules linked in:
CR2: 0000000000055640
---[ end trace 89ccecc4a95c6c31 ]---
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x18/0x80 lib/iomap.c:90
Code: b7 c0 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 53 48 89 fb e8 36 fd 8c fd 48 81 fb 00 00 04 00 72 09 e8 28 fd 8c fd <8b> 03 eb 58 48 81 fb 01 00 01 00 72 0b e8 16 fd 8c fd 0f b7 d3 ed
RSP: 0018:ffffc900031afae8 EFLAGS: 00010293
RAX: ffffffff83ebff88 RBX: 0000000000055640 RCX: ffff888021f31dc0
RDX: 0000000000000000 RSI: ffffffff8a2b2be0 RDI: 0000000000055640
RBP: ffffc900031afbd0 R08: ffffffff901ee117 R09: 1ffffffff203dc22
R10: dffffc0000000000 R11: fffffbfff203dc23 R12: 0000000000055640
R13: ffffffff8a7ed398 R14: 1ffff92000635f68 R15: ffff8880621e9828
FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000055640 CR3: 0000000063baf000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: b7 c0 mov $0xc0,%bh
2: 5b pop %rbx
3: 5d pop %rbp
4: c3 ret
5: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
c: 00 00 00
f: 0f 1f 00 nopl (%rax)
12: 55 push %rbp
13: 53 push %rbx
14: 48 89 fb mov %rdi,%rbx
17: e8 36 fd 8c fd call 0xfd8cfd52
1c: 48 81 fb 00 00 04 00 cmp $0x40000,%rbx
23: 72 09 jb 0x2e
25: e8 28 fd 8c fd call 0xfd8cfd52
* 2a: 8b 03 mov (%rbx),%eax <-- trapping instruction
2c: eb 58 jmp 0x86
2e: 48 81 fb 01 00 01 00 cmp $0x10001,%rbx
35: 72 0b jb 0x42
37: e8 16 fd 8c fd call 0xfd8cfd52
3c: 0f b7 d3 movzwl %bx,%edx
3f: ed in (%dx),%eax
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 6e2fd6534337 Linux 5.15.213
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14f27e32580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f161cbc9aef65db0
dashboard link: https://syzkaller.appspot.com/bug?extid=6f1d620d17b844ec2cf7
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d7b46606b13d/disk-6e2fd653.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/da120fdeb081/vmlinux-6e2fd653.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3c2643457e3f/bzImage-6e2fd653.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6f1d62...@syzkaller.appspotmail.com
BUG: unable to handle page fault for address: 0000000000055640
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 5f69b067 P4D 5f69b067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4231 Comm: kworker/0:5 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events work_for_cpu_fn
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x18/0x80 lib/iomap.c:90
Code: b7 c0 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 53 48 89 fb e8 36 fd 8c fd 48 81 fb 00 00 04 00 72 09 e8 28 fd 8c fd <8b> 03 eb 58 48 81 fb 01 00 01 00 72 0b e8 16 fd 8c fd 0f b7 d3 ed
RSP: 0018:ffffc900031afae8 EFLAGS: 00010293
RAX: ffffffff83ebff88 RBX: 0000000000055640 RCX: ffff888021f31dc0
RDX: 0000000000000000 RSI: ffffffff8a2b2be0 RDI: 0000000000055640
RBP: ffffc900031afbd0 R08: ffffffff901ee117 R09: 1ffffffff203dc22
R10: dffffc0000000000 R11: fffffbfff203dc23 R12: 0000000000055640
R13: ffffffff8a7ed398 R14: 1ffff92000635f68 R15: ffff8880621e9828
FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000055640 CR3: 0000000063baf000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
nhi_probe+0x225/0xb40 drivers/thunderbolt/nhi.c:1281
local_pci_probe+0xc5/0x150 drivers/pci/pci-driver.c:323
work_for_cpu_fn+0x50/0x80 kernel/workqueue.c:5217
process_one_work+0x867/0xff0 kernel/workqueue.c:2310
process_scheduled_works kernel/workqueue.c:2373 [inline]
worker_thread+0xe01/0x12a0 kernel/workqueue.c:2462
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
Modules linked in:
CR2: 0000000000055640
---[ end trace 89ccecc4a95c6c31 ]---
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x18/0x80 lib/iomap.c:90
Code: b7 c0 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 53 48 89 fb e8 36 fd 8c fd 48 81 fb 00 00 04 00 72 09 e8 28 fd 8c fd <8b> 03 eb 58 48 81 fb 01 00 01 00 72 0b e8 16 fd 8c fd 0f b7 d3 ed
RSP: 0018:ffffc900031afae8 EFLAGS: 00010293
RAX: ffffffff83ebff88 RBX: 0000000000055640 RCX: ffff888021f31dc0
RDX: 0000000000000000 RSI: ffffffff8a2b2be0 RDI: 0000000000055640
RBP: ffffc900031afbd0 R08: ffffffff901ee117 R09: 1ffffffff203dc22
R10: dffffc0000000000 R11: fffffbfff203dc23 R12: 0000000000055640
R13: ffffffff8a7ed398 R14: 1ffff92000635f68 R15: ffff8880621e9828
FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000055640 CR3: 0000000063baf000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: b7 c0 mov $0xc0,%bh
2: 5b pop %rbx
3: 5d pop %rbp
4: c3 ret
5: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
c: 00 00 00
f: 0f 1f 00 nopl (%rax)
12: 55 push %rbp
13: 53 push %rbx
14: 48 89 fb mov %rdi,%rbx
17: e8 36 fd 8c fd call 0xfd8cfd52
1c: 48 81 fb 00 00 04 00 cmp $0x40000,%rbx
23: 72 09 jb 0x2e
25: e8 28 fd 8c fd call 0xfd8cfd52
* 2a: 8b 03 mov (%rbx),%eax <-- trapping instruction
2c: eb 58 jmp 0x86
2e: 48 81 fb 01 00 01 00 cmp $0x10001,%rbx
35: 72 0b jb 0x42
37: e8 16 fd 8c fd call 0xfd8cfd52
3c: 0f b7 d3 movzwl %bx,%edx
3f: ed in (%dx),%eax
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot
Aug 4, 2026, 10:44:36 PM (19 hours ago) Aug 4
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: fb28aa725e05 Linux 6.1.180
syzbot found the following issue on:
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=172ccbb9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=31dfefc4a14efea3
dashboard link: https://syzkaller.appspot.com/bug?extid=3c34180b8b6661c4ffc0
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9a6fe2a54d0f/disk-fb28aa72.raw.xz
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
vmlinux: https://storage.googleapis.com/syzbot-assets/742b23a1d931/vmlinux-fb28aa72.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b3f257c16d2e/bzImage-fb28aa72.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
BUG: unable to handle page fault for address: 0000000000055640
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4279 Comm: kworker/0:3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events work_for_cpu_fn
RIP: 0010:readl arch/x86/include/asm/io.h:61 [inline]
Workqueue: events work_for_cpu_fn
RIP: 0010:ioread32+0x18/0x80 lib/iomap.c:99
Code: c0 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 53 48 89 fb e8 96 d2 68 fd 48 81 fb 00 00 04 00 72 09 e8 88 d2 68 fd <8b> 03 eb 57 48 81 fb 01 00 01 00 72 0a e8 76 d2 68 fd 89 da ed eb
RSP: 0018:ffffc90004307ae8 EFLAGS: 00010293
RAX: ffffffff84195b98 RBX: 0000000000055640 RCX: ffff8880735f3c00
RDX: 0000000000000000 RSI: ffffffff8a8c17a0 RDI: 0000000000055640
RBP: ffffc90004307bd0 R08: ffffffff90b1028f R09: 1ffffffff2162051
R10: dffffc0000000000 R11: fffffbfff2162052 R12: 0000000000055640
R13: dffffc0000000000 R14: ffff8881432f6000 R15: ffff888057b0cc28
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000055640 CR3: 000000005c08a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
nhi_probe+0x264/0xc20 drivers/thunderbolt/nhi.c:1319
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
local_pci_probe+0xc5/0x150 drivers/pci/pci-driver.c:324
work_for_cpu_fn+0x50/0x80 kernel/workqueue.c:5184
process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
CR2: 0000000000055640
---[ end trace 0000000000000000 ]---
RIP: 0010:readl arch/x86/include/asm/io.h:61 [inline]
RIP: 0010:ioread32+0x18/0x80 lib/iomap.c:99
Code: c0 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 53 48 89 fb e8 96 d2 68 fd 48 81 fb 00 00 04 00 72 09 e8 88 d2 68 fd <8b> 03 eb 57 48 81 fb 01 00 01 00 72 0a e8 76 d2 68 fd 89 da ed eb
RSP: 0018:ffffc90004307ae8 EFLAGS: 00010293
RAX: ffffffff84195b98 RBX: 0000000000055640 RCX: ffff8880735f3c00
RDX: 0000000000000000 RSI: ffffffff8a8c17a0 RDI: 0000000000055640
RBP: ffffc90004307bd0 R08: ffffffff90b1028f R09: 1ffffffff2162051
R10: dffffc0000000000 R11: fffffbfff2162052 R12: 0000000000055640
R13: dffffc0000000000 R14: ffff8881432f6000 R15: ffff888057b0cc28
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000055640 CR3: 000000005c08a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: c0 5b 5d c3 rcrb $0xc3,0x5d(%rbx)
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
4: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
b: 00 00 00
e: 0f 1f 40 00 nopl 0x0(%rax)
12: 55 push %rbp
13: 53 push %rbx
14: 48 89 fb mov %rdi,%rbx
17: e8 96 d2 68 fd call 0xfd68d2b2
13: 53 push %rbx
14: 48 89 fb mov %rdi,%rbx
1c: 48 81 fb 00 00 04 00 cmp $0x40000,%rbx
23: 72 09 jb 0x2e
25: e8 88 d2 68 fd call 0xfd68d2b2
23: 72 09 jb 0x2e
* 2a: 8b 03 mov (%rbx),%eax <-- trapping instruction
2c: eb 57 jmp 0x85
2e: 48 81 fb 01 00 01 00 cmp $0x10001,%rbx
35: 72 0a jb 0x41
37: e8 76 d2 68 fd call 0xfd68d2b2
3c: 89 da mov %ebx,%edx
3e: ed in (%dx),%eax
3f: eb .byte 0xeb
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